Silica Water Testing Kits

Silica High Range and Low Range  Handheld Colorimeter

  • Easier to use and more accurate than chemical test kits
  • Dedicated to a single parameter
  • Small size, big convenience
  • Ideal for: Aquaculture, water quality
  • Environmental, water treatment

Silica is the name given to silicon dioxide, SiO2. Silicon (Si), is the most abundant element in the Earth’s crust, 28% of it by weight. Silicon is never found free form in nature. In crystallised form it is only reactive under conditions of extremely high temperatures. Water and water vapour have little influence upon silicon solubility, because a protective surface layer of silicon dioxide is rapidly formed. Silicon binds with other elements to form various species of silica and silicate. The concentration of the soluble silica molecules are important to aquaculture because they influence (and limit) the growth of diatoms.

In most waters, the predominant form of dissolved silica is monosilicic acid, which incorporates two water molecules.

The HI705 and HI770 Checker®HC Handheld Colorimeters are a simple, accurate, and cost effective way to measure silica. Each model is designed for a specific range (low or high) in order to provide high levels of accuracy.

The contoured style of these Checkers®HC fit easily in the palm of your hand or pocket and the large LCD is easy to read. The auto shut-off feature assures the battery life will not be drained if you forget to turn it off.

HI770 (HR)HI705 (LR)
Range0 to 200 ppm0 .00 to 2.00 ppm
Resolution1 ppm0.1 ppm
Accuracy @ 25°C/77°F±2 ppm ±5% of reading±0.03 ppm ±5% of reading
Light SourceLED @ 470 nmLED @ 610 nm
Light Detectorsilicon photocell
Environment0 to 50°C (32 to 122°F); RH max 95% non-condensing
Battery Type(1) 1.5V AAA
Auto-offafter ten minutes of non-use
Dimensions81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”)
Weight64 g (2.25 oz.
Methodadaptation of the USEPA method 370.1 for drinking, surface and saline waters and Standard Method 4500-SiO₂ C for domestic and industrial watersadaptation of the ASTM D859, heteropoly blue method

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